Technical data for Inch size thread forming and trilobular tapping screws

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This product is regulated by the following standards:

Standard ASME B18.6.3

Inch size thread forming and trilobular tapping screws

Dimensions in INCHES - source ASME B18.6.3 TABLE 45 for type TRS Tapping Screws
Nominal screw size	Basic screw diameter	Major or C diameter (max)	P Point diameter (max)
2-56	0.086	0.0875	0.07
3-48	0.099	0.101	0.081
4-40
5-40
6-32
8-32
10-24
10-32
12-24
1/4-20
5/16-18
3/8-16
7-16-14
1/2-20

The definitive version for the implementation of this standard is the edition bearing the most recent date of issue, obtainable from IFI – Industrial Fastener Institute, 6363 Oak Tree Blvd Independence, OH 44131, USA.
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Technical data for Inch size thread forming and trilobular tapping screws

This product is regulated by the following standards:

Standard ASME B18.6.3

Inch size thread forming and trilobular tapping screws

Suppliers of Inch size thread forming and trilobular tapping screws

Distributor of inch fasteners as per British and American standards

Manufacturer of special cold and hot forged nuts and bolts: Metric, UNF, UNC, BSF & BSW (Whitworth) threadforms

Manufacturer of furniture fasteners, self tapping screws, chipboard and drywall screws, threaded rods, threaded inserts, barrel and tee nuts

Manufacturer of self tapping screws, machine screws and thread rolling screws. Metric and inch sizes